Might consider just buying the gun instead of leveling engineering to 375. There really isn't anything at 375 that is worth it, imho.
I have the nightbane shield and it does sadden me that I replaced it with that dawnforged one. For me personally, Nightbane meant an awful lot to tank and kill so replacing the shield was a hard one.
Can't blame you for ditching a group after hearing about "promised loot." I do that myself If you're a pugger like me, then you pretty much live in kara/za/heroics with the occasional gruul's. Your gear is fine for that stuff. za has a lot of great items (that look cool too) so keep plugging away at za. Keep farming kara and you'll end up better geared that a lot of T5 raiders :P
Former healbot now a Disgruntled protection warrior.